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Real Estate and Intangible Assets - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2015 Farm acre | Mar. 31, 2015 Farm acre | Mar. 31, 2014 Farm acre | Feb. 23, 2015 Renewal_Options | Feb. 09, 2015 | Nov. 01, 2015
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of Farms | 34 land_NumberOfRealEstateFarms | 34 land_NumberOfRealEstateFarms | 21 land_NumberOfRealEstateFarms |  |  |
Number of farms acquired in separate transaction |  | 2 land_NumberOfFarmsAcquiredNotCoveredUnderBusinessCombination |  |  |  |
Number of farms acquired |  | 2 land_NumberOfFarmsAcquired |  |  |  |
Rental income |  | $ 2,622,327 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue | $ 1,495,636 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue |  |  |
Aggregate annual real estate property taxes | 1,075,000 us-gaap_RealEstateTaxExpense |  |  |  |  |
Payables for real estate property taxes | 518,000 us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent | 518,000 us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent |  |  |  |
Area leased | 8,789 us-gaap_AreaOfRealEstateProperty | 8,789 us-gaap_AreaOfRealEstateProperty | 6,000 us-gaap_AreaOfRealEstateProperty |  |  |
Area leased, percentage |  | 100.00%land_PercentageOfAreaOfLand | 100.00%land_PercentageOfAreaOfLand |  |  |
Percent of total rental revenue |  | 100.00%land_PercentageOfRentalRevenue | 100.00%land_PercentageOfRentalRevenue |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Payables for real estate property taxes |  |  |  |  |  | 171,000 us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrentAndNoncurrent / us-gaap_StatementScenarioAxis = us-gaap_ScenarioForecastMember
California [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of Farms | 15 land_NumberOfRealEstateFarms / us-gaap_StatementGeographicalAxis = stpr_CA | 15 land_NumberOfRealEstateFarms / us-gaap_StatementGeographicalAxis = stpr_CA | 8 land_NumberOfRealEstateFarms / us-gaap_StatementGeographicalAxis = stpr_CA |  |  |
Rental income |  | 1,839,707 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_StatementGeographicalAxis = stpr_CA | 1,013,612 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_StatementGeographicalAxis = stpr_CA |  |  |
Area leased | 2,722 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_CA | 2,722 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_CA | 1,454 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_CA |  |  |
Area leased, percentage | 31.00%land_PercentageOfAreaOfLand / us-gaap_StatementGeographicalAxis = stpr_CA | 31.00%land_PercentageOfAreaOfLand / us-gaap_StatementGeographicalAxis = stpr_CA | 24.20%land_PercentageOfAreaOfLand / us-gaap_StatementGeographicalAxis = stpr_CA |  |  |
Percent of total rental revenue |  | 70.20%land_PercentageOfRentalRevenue / us-gaap_StatementGeographicalAxis = stpr_CA | 67.80%land_PercentageOfRentalRevenue / us-gaap_StatementGeographicalAxis = stpr_CA |  |  |
Oregon [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of Farms |  | 4 land_NumberOfRealEstateFarms / us-gaap_StatementGeographicalAxis = stpr_OR | 2 land_NumberOfRealEstateFarms / us-gaap_StatementGeographicalAxis = stpr_OR |  |  |
Rental income |  | 291,537 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_StatementGeographicalAxis = stpr_OR | 238,025 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_StatementGeographicalAxis = stpr_OR |  |  |
Area leased | 2,313 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_OR | 2,313 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_OR | 2,113 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_OR |  |  |
Area leased, percentage |  | 26.30%land_PercentageOfAreaOfLand / us-gaap_StatementGeographicalAxis = stpr_OR | 35.20%land_PercentageOfAreaOfLand / us-gaap_StatementGeographicalAxis = stpr_OR |  |  |
Percent of total rental revenue |  | 11.10%land_PercentageOfRentalRevenue / us-gaap_StatementGeographicalAxis = stpr_OR | 15.90%land_PercentageOfRentalRevenue / us-gaap_StatementGeographicalAxis = stpr_OR |  |  |
Florida [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Number of Farms |  | 10 land_NumberOfRealEstateFarms / us-gaap_StatementGeographicalAxis = stpr_FL | 6 land_NumberOfRealEstateFarms / us-gaap_StatementGeographicalAxis = stpr_FL |  |  |
Rental income |  | 349,488 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_StatementGeographicalAxis = stpr_FL | 116,982 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_StatementGeographicalAxis = stpr_FL |  |  |
Area leased | 1,723 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_FL | 1,723 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_FL | 402 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementGeographicalAxis = stpr_FL |  |  |
Area leased, percentage |  | 19.60%land_PercentageOfAreaOfLand / us-gaap_StatementGeographicalAxis = stpr_FL | 6.70%land_PercentageOfAreaOfLand / us-gaap_StatementGeographicalAxis = stpr_FL |  |  |
Percent of total rental revenue |  | 13.30%land_PercentageOfRentalRevenue / us-gaap_StatementGeographicalAxis = stpr_FL | 7.80%land_PercentageOfRentalRevenue / us-gaap_StatementGeographicalAxis = stpr_FL |  |  |
Maximum [Member] | Geographic Concentration Risk [Member] | Rental Income [Member] | California [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Percentage of individual tenant represented total rental revenue recorded |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = land_RentalIncomeMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = stpr_CA | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = land_RentalIncomeMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementGeographicalAxis = stpr_CA |  |  |
Dole Food Company [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Rental income |  | 700,000 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember |  |  |  |
Total number of lease agreement with single tenant | 2 land_NumberOfLeaseWithSingleTenant / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember |  |  |  |  |
Area leased | 960 us-gaap_AreaOfRealEstateProperty / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember | 960 us-gaap_AreaOfRealEstateProperty / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember |  |  |  |
Area leased, percentage | 10.90%land_PercentageOfAreaOfLand / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember |  |  |  |  |
Percent of total rental revenue |  | 28.10%land_PercentageOfRentalRevenue / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember | 47.20%land_PercentageOfRentalRevenue / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember |  |  |
Dole Food Company [Member] | Maximum [Member] | Customer Concentration Risk [Member] | Rental Income [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Percentage of individual tenant represented total rental revenue recorded |  | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = land_RentalIncomeMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = land_RentalIncomeMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_CounterpartyNameAxis = land_DoleFoodCompanyMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Separate Tenant [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Percent of total rental revenue |  | 11.70%land_PercentageOfRentalRevenue / us-gaap_CounterpartyNameAxis = land_SeparateTenantsMember | 12.70%land_PercentageOfRentalRevenue / us-gaap_CounterpartyNameAxis = land_SeparateTenantsMember |  |  |
Spring Valley [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Maturity date of lease |  |  |  | Sep. 30, 2022 |  |
Rental income |  |  |  | 327,904 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_RealEstatePropertiesAxis = land_SpringValleyMember |  |
Percentage increase in lease amount |  |  |  | 32.50%land_PercentageIncrementInLeasePayments / us-gaap_RealEstatePropertiesAxis = land_SpringValleyMember |  |
Lease renewal term |  |  |  | 6 years |  |
Number of options granted to extend the lease |  |  |  | 2 land_OperatingLeasesNumberOfOptionsToExtendLease / us-gaap_RealEstatePropertiesAxis = land_SpringValleyMember |  |
Additional extension period of under the option of tenant |  |  |  | 6 years |  |
Keysville Road [Member] |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |
Maturity date of lease |  |  |  |  | Jun. 30, 2020 |
Rental income |  |  |  |  | 73,749 us-gaap_OperatingLeasesIncomeStatementLeaseRevenue / us-gaap_RealEstatePropertiesAxis = land_KeysvilleRoadMember |
Percentage increase in lease amount |  |  |  |  | 7.90%land_PercentageIncrementInLeasePayments / us-gaap_RealEstatePropertiesAxis = land_KeysvilleRoadMember |
Write-off of deferred rent asset balances and rental income related to terminated lease |  | $ 32,497 land_DeferredRentAssetBalanceAndRentalIncomeWrittenOffOnLeaseTermination / us-gaap_RealEstatePropertiesAxis = land_KeysvilleRoadMember |  |  |  |

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